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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2019
Earnings Per Share, Basic and Diluted [Abstract] |
EARNINGS (LOSS) PER SHARE | EARNINGS PER SHARE The computation of basic and diluted earnings per common share was as follows:
| Three Months Ended March 31,
| 2019 |  | 2018
Amounts attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |
Net income attributable to Quest Diagnostics | $ | 164 |  |  | $ | 177 |
Less: Earnings allocated to participating securities | 1 |  |  | 1 |
Earnings available to Quest Diagnostics’ common stockholders – basic and diluted | $ | 163 |  |  | $ | 176 |
Weighted average common shares outstanding – basic | 134 |  |  | 136 |
Effect of dilutive securities: |  |  |  |  |
Stock options and performance share units | 2 |  |  | 3 |
Weighted average common shares outstanding – diluted | 136 |  |  | 139 |
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |  |
Basic | $ | 1.22 |  |  | $ | 1.30 |
Diluted | $ | 1.20 |  |  | $ | 1.27 |
The following securities were not included in the calculation of diluted earnings per share due to their antidilutive effect:
| Three Months Ended March 31,
| 2019 |  | 2018
Stock options | 4 |  |  | 2 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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